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CALIFORNIA 'ENVIRONMENTAL PROTECTION AGENCY <br /> DEPARTMENT OF TOXIC SUBSTANCES CONTROL <br /> LODI GROUNDWATER ASSESSMENT <br /> Fact Sheet #3 August 1995 <br /> INTRODUCTION operates 24 public water supply wells. Currently, <br /> ii ii ad city Wells (Cv'vI (Nrr2, t;.av$a.R; ivv.) weld <br /> This fact sheet provides an update on the found to contain concentrations of PCE and TCE <br /> California Department of Toxic Substances above the State Maximum Contaminant Levels <br /> Control's(DTSC)Phase II ongoing investigation of (MCLS) and have been taken out of service. <br /> the extent and sources of dry cleaning and VOCs below the MCLs have also been detected <br /> Industrial solvents called volatile organic in CW24. PCE is used in the drying cleaning <br /> compounds (VOCs), In the City of Lodi's (City) Industry, TCE and 1,1,1-TCA are industrial <br /> soil and groundwater. It also describes the solvents used to dean metal parts. <br /> cleanup efforts being negotiated by DTSC and <br /> potentially responsible parties (PRPs). Two Based on the Investigations by the Central Valley <br /> previous fact sheets have been sent out regarding Regional Water Quality Control Board conducted <br /> the Lodi groundwater Investigation. Fact between 1989 and 1991, and DTSC's Phase I <br /> Sheet #1 was sent out in October 1993, and Fact Investigation In 1993, DTSC Identified Lustre-Cal <br /> Sheet #2 was sent out in October 1994. Nameplate Corporation,Guild Cleaners,and Busy <br /> Bee Laundry and Dry Cleaners as likely sources <br /> Building on the results of DTSC's Phase I contributing to the groundwater contamination <br /> Investigation, the Phase II Investigation includes: found in CW2, CW3, CW4,and CW24. In addition, <br /> (1) soil gas survey, and (2) sewer sampling and the City's sewer lines and ,drinking water wells <br /> video survey. The Phase II Investigation area has were found to cause further spread of <br /> been expanded from the Phase I area and is contamination in groundwater. Additional <br /> bounded on the north by the Mokelumne River, investigation Is necessary to determine If there are <br /> on the south by Sierra Vista Place, on the east by additional contaminated areas and/or other <br /> Washington Street, and on the west by Orange Industries that may have contributed to this <br /> Street. problem. The City's drinking water presently <br /> This fact sheet discusses field sampling activities <br /> and sampling methods to be conducted. SOIL GAS SURVEY <br /> Throughout this Fact Sheet, words or phrases in <br /> bold type are defined in the glossary on page g. The objectives of the soil gas survey are to: (1) <br /> identify additional contaminated areas and locate <br /> SITE BACKGROUND additional VOC spill or disposal areas; (2) <br /> determine the extent of the VOCs In the <br /> VOC contamination of the groundwater beneath subsurface and directional trends in subsurface <br /> the City was first detected in 1989 during contaminant; and (3) identify the boundary of <br /> sampling of public water supply wells. contaminated groundwater plume. To accomplish <br /> these objectives, DTSC will collect soil gas <br /> Subsequent samples were taken by the City to samples from 270 locations in the Phase II <br /> confirm the discovery. The VOCs that have been investigation area. <br /> detected In the groundwater include, but are not <br /> limited to: perchloroethylene (PCE), A hole 2 Inches in diameter will be drilled to a <br /> t r i c h l o r o e t h e n e ( TCE ) , and depth of 18 Inches at each sampling location for <br /> 1,1,1-trichloroethane (1,1,14CA). The City installation of sampling devices. Time required for <br />